Late intrauterine growth restriction is infrequently diagnosed with an overall sensitivity of 40 % in low-risk pregnancies. In addition, late intrauterine growth restriction may be associated with intrauterine death and poor neonatal outcomes i.e. birth asphyxia and hospitalization in intensive care unit. The investigators hypothesis that a later third trimester routine ultrasound may be more accurate to diagnose late intrauterine growth restriction.

Inclusion Criteria:

• Accurate gestational dating using crown-rump length at 11-14 weeks
• Singleton pregnancy
• Primiparity
• Normal First trimester (11-14 weeks) and second trimester (20-25 weeks) scans
• Maternal age > 18 years
• No maternal opposition for the study

Exclusion Criteria:

• Maternal diseases i.e. chronic renal disease, hypertension, diabetes, collagen vascular disease, antiphospholipid syndrome
• Pregnancies with congenital anomalies or foetal growth restriction diagnosed before 30 weeks of gestation